Windows 7 boot with Mac OS - 1 HDD

[mohen]

Hello guys, 

I got to admit I'm really confused with all this multi booting,

so i'm just looking for you all professional advice to help me out.

I got a laptop, Asus u36sd.

It's has one HDD 750 GB that splits to :

1. C: windows 7 boot

2. d:

3. 20 GB unallocated space which I want to reserve for the future (  

   to install Backtrack 5 linux ) 

 

so please , correct me if i'm wrong.

my plan is to shrink drive D, and free at least 80 GB for the MAC OS and 

name the volume as E (so drive D actually will be for windows 7 ) .

then i'm planning to install the the Mac OS mavericks using this 

tutorial

 

http://www.tonymacx86.com/374-[url="http://www.insanelymac.com/forum/topic/279450-why-insanelymac-does-not-support-tonymacx86/"]#####[/url]-install-os-x-mavericks-any-supported-intel-based-pc.html

 

but the problem is , i know as soon as i'll finish to install the 

Mac OS it will destory my windows 7 boot and i will not be able

to boot into windows 7 anymore.

what is the right orders I need to do for not messing my windows 7.

thanks in advance !